IPA: /ˈɡlæm.ər.ləs/
KK: /ˈɡlæmərləs/
Lacking charm, beauty, or excitement; ordinary and unremarkable.
The hotel was nice, but it had a glamourless atmosphere that didn't impress the guests.
Glamourless → It is formed from "glamour" (from Scottish *glamour*, meaning enchantment or magic) and "-less" (meaning without). The word "glamourless" means lacking enchantment or charm.
Think of 'glamour' as enchantment or charm, and remember that 'glamourless' means without that charm.